Google street view image for 21 Sterling Rd S, Armonk, NY 10504

Off Market Sep 2025 for $6.6M

$4,594,404

Est. refi paymentEst. refi $50,427/mo

—

•

4 ba

•

13,726

sq ft

21 Sterling Rd S, Armonk, NY 10504

About this home

21 Sterling Rd S is a 13,726 square foot house on a 2.64 acre lot with 4 bathrooms. - it last sold on September 25, 2025 for $6,615,000. Based on Redfin's Armonk data, we estimate the home's value is $4,594,404.

Single-familyProperty Type

2006Year Built

2.64 acresLot Size

$335Est. Price/Sq.Ft.

2 spacesParking

Source:Public Records

Redfin Estimate

$4,594,404

$2.0M since sold in September 2025$391K since August

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 3.3% lower than the average sale price ($4.75M) of 6 comparable homes.

SOLD SEP 15, 2025
$6,615,000
A
6 beds7.5 baths11,615 sq ft
21 S Sterling Rd, Armonk, NY 10504
Listing by Compass Greater NY, LLC
SOLD SEP 1, 2026
$2,600,000
B
5 beds5.5 baths6,296 sq ft
86 Old Byram Lake Rd, Armonk, NY 10504
Listing by William Raveis Real Estate
SOLD AUG 31, 2026
$3,600,000
C
5 beds8.5 baths7,663 sq ft
8 Ridgeview Cir, Armonk, NY 10504
Listing by Compass Greater NY, LLC
SOLD AUG 31, 2026
$8,500,000
D
7 beds8.5 baths13,974 sq ft
170 Old Mill Rd, Greenwich, CT 06831
SOLD SEP 1, 2026
$4,000,000
E
5 beds7 baths6,216 sq ft
55 Will Merry Ln, Greenwich, CT 06831
SOLD JUL 29, 2026
$3,200,000
F
4 beds7 baths10,143 sq ft
7 Ridgeview Cir, Armonk, NY 10504
Listing by DeSimone Real Estate

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Earn from this home

Sell

−$876,400

Est. take-home

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Est. cash available

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Rent

$4,712/mo

Redfin rental estimate

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Market trends in 10504, NY

Last updated August 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-List Price

105.9%

+0.1% MoM

Median sale price

$1.9M

$152K MoM

Avg. days on market

21d

4 days MoM

Recently sold homes

5 MoM

New listings for sale

COMING SOON
$1,800,000
4 beds3.5 baths2,900 sq ft
8 Rosehill Dr, Armonk, NY 10504
Listing by William Raveis Real Estate
NEW 32 HRS AGO
$5,895,000
6 beds6.5 baths4,653 sq ft
9 Cole Dr, Armonk, NY 10504
Listing by Houlihan Lawrence Inc.
COMING SOON
$1,150,000
4 beds2.5 baths2,296 sq ft
12 Lyons Rd, Armonk, NY 10504
Listing by Compass Greater NY, LLC
$1,575,000
3 beds3 baths2,360 sq ft
5 Byram Brook Pl, Armonk, NY 10504
Listing by Houlihan Lawrence Inc.
$1,595,000
3 beds3.5 baths3,273 sq ft
3 Cider Mill Cir, Armonk, NY 10504
Listing by William Raveis Real Estate
See all

Provided by Redfin

Sale history for 21 Sterling Rd S

Year

Property tax

Land + Additions

Assessment*

2026

$86,473 (+2.0%)

$3,300 + $73,700

$77,000

2025

$84,778 (−1.6%)

$3,300 + $73,700

$77,000

2024

$86,117 (+4.5%)

$3,300 + $73,700

$77,000

2023

$82,447 (+2.4%)

$3,300 + $73,700

$77,000

2022

$80,487 (+1.5%)

$3,300 + $73,700

$77,000

2021

$79,286 (−0.3%)

$3,300 + $73,700

$77,000

2020

$79,509

$3,300 + $73,700

$77,000

2019

$79,523

$3,300 + $73,700

$77,000

2018

$3,300 + $73,700

$77,000

2017

$3,300 + $73,700

$77,000

2016

$3,300 + $73,700

$77,000

2014

$3,300 + $73,700

$77,000

2013

$3,300 + $73,700

$77,000

Tax history for 21 Sterling Rd S

Year

Property tax

Land + Additions

Assessment*

2026

$86,473 (+2.0%)

$3,300 + $73,700

$77,000

2025

$84,778 (−1.6%)

$3,300 + $73,700

$77,000

2024

$86,117 (+4.5%)

$3,300 + $73,700

$77,000

2023

$82,447 (+2.4%)

$3,300 + $73,700

$77,000

2022

$80,487 (+1.5%)

$3,300 + $73,700

$77,000

2021

$79,286 (−0.3%)

$3,300 + $73,700

$77,000

2020

$79,509

$3,300 + $73,700

$77,000

2019

$79,523

$3,300 + $73,700

$77,000

2018

$3,300 + $73,700

$77,000

2017

$3,300 + $73,700

$77,000

2016

$3,300 + $73,700

$77,000

2014

$3,300 + $73,700

$77,000

2013

$3,300 + $73,700

$77,000

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Property details

Interior

Basement Information
Basement Sq. Ft: 2,391
Basement Type: Full

Bathroom Information
# of Full Baths: 4

Heating & Cooling
Air Conditioning Type: Central

Fireplace Information
# of Fireplaces: 3
Has Fireplace

Exterior

Exterior Information
Physical Condition: Average

Property Information
Living Sq. Ft: 13,726
Ground Floor Sq. Ft: 11,335
Building Sq. Ft: 14,226

Parking & Garage Information
Parking Type: Attached Garage
Garage/Parking Sq. Ft: 500
Garage / Carport Type: Attached

Lot Information
# of Buildings: 1
Land Sq. Ft: 115,093
Legal Lot Number: 12
Legal Block Number: 1
School Tax District: BYRAM HILLS
Municipality Name: NORTH CASTLE
Acres: 2.6422
State Use Description: SINGLE FAMILY RESID

Utility Information
Water Service Type: Private

Financial

Assessor Information
Assessment Year: 2025

Public facts

Beds: —
Baths: 4.0
Sq. Ft.: 13,726
Stories: —
Lot Size: 2.64 acres
Style: Single Family Residential
Year Built: 2006
Year Renovated: —
County: Westchester County
APN: 553800A10800400010120000000

Home facts updated by county records on Jul 30, 2026

Around this home

Schools

Wampus School

Public 3-5 • Assigned • 1.2mi

10/10

H C Crittenden Middle School

Public 6-8 • Assigned • 1.0mi

9/10

Byram Hills High School

Public 9-12 • Assigned • 1.0mi

9/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Climate risks

1/10 Flood Factor

Minimal risk of a flood reaching the building in the next 30 years

1/10 Fire Factor

Unlikely to be in a wildfire in next 30 years

5/10 Heat Factor

7 days above 97° expected this year, 15 days in 30 years

6/10 Wind Factor

27% chance of strong winds in next 30 years

4/10 Air Factor

5 unhealthy days expected this year, 7 days in 30 years

Provided by First Street

Historical weather

Armonk, NY • 10504

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 8.7 hours in June and 4.3 hours in December, placing it below the U.S. average for solar exposure.

8.7 hrs

4.3 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$4.37M – $5.28M

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New listings for sale in 10504

COMING SOON

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Listing by William Raveis Real Estate

NEW 32 HRS AGO

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COMING SOON

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Listing by Compass Greater NY, LLC

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3 beds3 baths2,360 sq ft

5 Byram Brook Pl, Armonk, NY 10504

Listing by Houlihan Lawrence Inc.

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Home values near 21 Sterling Rd S

Data from public records.

Address	Redfin Estimate
18 Sterling Road South, Armonk, NY 5 Beds \| 7 Baths \| 10000 Sq. Ft.	$5,856,696
19 Sterling Road South, Armonk, NY - Beds \| 8 Baths \| 7510 Sq. Ft.	$3,381,350

Address	Redfin Estimate
24 Sterling Road South, Armonk, NY 4 Beds \| 3.5 Baths \| 6275 Sq. Ft.	$2,630,300
20 Sterling Road South, Armonk, NY 5 Beds \| 8.5 Baths \| 11332 Sq. Ft.	$6,890,319

Address	Redfin Estimate
15 Sterling Road South, Armonk, NY - Beds \| 4 Baths \| 4885 Sq. Ft.	$1,914,170
28 Sterling Road South, Armonk, NY 4 Beds \| 4.5 Baths \| 4750 Sq. Ft.	$2,393,315

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